CN114765009A

CN114765009A - Display device and driving method of display device

Info

Publication number: CN114765009A
Application number: CN202111453996.8A
Authority: CN
Inventors: 李俊熙; 高楠坤; 朴东远
Original assignee: LG Display Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2020-12-31
Filing date: 2021-12-01
Publication date: 2022-07-19
Anticipated expiration: 2041-12-01
Also published as: CN114765009B; US11991374B2; KR20220096624A; US20220210450A1

Abstract

A display device and a driving method of the display device. A display device, comprising: an encoder that compresses the first image data to generate second image data; a decoder that generates third image data based on the restored first image data; and a display panel that displays an image, wherein the encoder separates the first image data into a plurality of sub-color data and generates a low frequency component of a secondary sub-color data and remaining sub-color data among the plurality of sub-color data as the second image data, and the decoder generates restored secondary sub-color data corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data and a high frequency component of one sub-color data among the remaining sub-color data in the second image data and generates the restored secondary sub-color data and the remaining sub-color data as the third image data.

Description

Display device and driving method of display device

Technical Field

The present disclosure relates to a display device, and more particularly, to a display device capable of reducing a data bandwidth.

Background

At present, with the advent of the information age in the whole field, the field of display devices that visually display electric information signals has been rapidly developed, and research for developing performances such as thinness, lightness in weight, and low power consumption for various display devices has been continuously conducted.

Among various display devices, the organic display device is a self-luminous display device, and unlike a liquid crystal display device, it does not require a separate light source, thereby being manufactured to be light-weight and thin. In addition, the organic display device has not only advantages in power consumption by low voltage driving but also excellent color realization, response speed, viewing angle, and Contrast Ratio (CR), and thus has been studied as a next-generation display.

Disclosure of Invention

An object to be achieved by the present disclosure is to provide a display device having a reduced data bandwidth required to achieve high-resolution display.

Another object to be achieved by the present disclosure is to provide a display device having excellent data recovery after image data compression.

The object of the present disclosure is not limited to the above object, and other objects not mentioned above will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present disclosure, a display apparatus includes: an encoder that compresses the first image data to generate second image data; a decoder that restores the first image data based on the second image data from the encoder to generate third image data; and a display panel that displays an image based on the third image data, wherein the encoder separates the first image data into a plurality of sub-color data and generates a low frequency component of the secondary sub-color data and remaining sub-color data among the plurality of sub-color data as the second image data, and the decoder generates restored secondary sub-color data corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data and a high frequency component of one sub-color data among the remaining sub-color data in the second image data and generates the restored secondary sub-color data and the remaining sub-color data as the third image data.

According to another aspect of the present disclosure, a driving method of a display device includes: generating second image data by compressing the first image data; and generating third image data by restoring the first image data based on the second image data, wherein the step of generating the second image data includes the steps of: separating the first image data into a plurality of sub-color data, and generating a low-frequency component of a secondary sub-color data and remaining sub-color data among the plurality of sub-color data as second image data, and generating third image data includes the steps of: generating restored secondary sub-color data corresponding to the secondary sub-color data by using a low frequency component of the secondary sub-color data in the second image data and a high frequency component of one sub-color data of the remaining sub-color data; and generating the restored secondary sub-color data and the remaining sub-color data as third image data.

Other details of the exemplary embodiments are included in the detailed description and the accompanying drawings.

According to the present disclosure, it is possible to minimize a bandwidth required to transmit image data by extracting high frequency components of the image data through Discrete Wavelet Transform (DWT) and rearranging the data.

According to the present disclosure, data recovery when recovering image data can be improved by recovering secondary sub-color data using a high-frequency component of primary sub-color data.

The effects according to the present disclosure are not limited to the above exemplified ones, and more various effects are included in the present specification.

Drawings

The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic block diagram of a display device according to an exemplary embodiment of the present disclosure;

fig. 2 is a block diagram of an encoder and a decoder of a display device according to an exemplary embodiment of the present disclosure;

fig. 3 is a flowchart for describing a driving method of a display device according to an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram for describing encoding and decoding of a display device according to an exemplary embodiment of the present disclosure; and

fig. 5 is a schematic diagram for describing an encoder of a display device according to an exemplary embodiment of the present disclosure.

Detailed Description

Advantages and features of the present disclosure and methods of accomplishing the same will become apparent by reference to the following detailed description of exemplary embodiments and the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be embodied in various forms. The exemplary embodiments are provided only as examples to enable those skilled in the art to fully understand the disclosure of the present disclosure and the scope of the present disclosure. Accordingly, the disclosure is to be limited only by the scope of the following claims.

Shapes, sizes, proportions, angles, numbers, and the like, which are illustrated in the accompanying drawings, for describing exemplary embodiments of the present disclosure, are merely examples, and the present disclosure is not limited thereto. Like reference numerals generally refer to like elements throughout the specification. Furthermore, in the following description of the present disclosure, a detailed explanation of known related art may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. Terms such as "comprising," having, "and" consisting of … …, "as used herein, are generally intended to allow for the addition of other components, unless such terms are used with the term" only. Any reference to the singular may include the plural unless it is explicitly stated otherwise.

Components are to be construed as including conventional error ranges even if not explicitly stated.

When terms such as "upper", "above", "lower", "next" and the like are used to describe a positional relationship between two components, one or more components may be located between the two components unless these terms are used with the terms "immediately" or "directly".

When an element or layer is "on" another element or layer, the other layer or element can be directly on the other element or between the two.

Although the terms "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component to be mentioned below may be the second component in the technical idea of the present disclosure.

Like reference numerals generally refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present disclosure is not limited to the size and thickness of the shown components.

Features of various embodiments of the present disclosure may be partially or fully attached or combined with each other and may be technically interlocked and operated in various ways, and the embodiments may be implemented independently of each other or in association with each other.

Hereinafter, a stretchable display device according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic block diagram of a display device according to an exemplary embodiment of the present disclosure. In fig. 1, for convenience of description, among the various components of the display apparatus 100, only the display panel DP, the gate driver GD, the data driver DD, the timing controller TCON, and the HOST system HOST are illustrated.

Referring to fig. 1, the display apparatus 100 includes: a display panel DP including a plurality of subpixels SP; a gate driver GD and a data driver DD supplying various signals to the display panel DP; and a timing controller TCON controlling the gate driver GD and the data driver DD.

The gate driver GD supplies a plurality of SCAN signals SCAN to the plurality of SCAN lines SL according to a plurality of gate control signals GCS supplied from the timing controller TCON. In fig. 1, one gate driver GD is illustrated to be spaced apart from one side of the display panel DP, but the gate driver GD may be provided in a gate-in-panel (GIP) method, and the number and arrangement of the gate drivers GD are not limited thereto.

The data driver DD converts the image data RGB input from the timing controller TCON into the data signal Vdata by using the reference gamma voltage according to the plurality of data control signals DCS supplied from the timing controller TCON. The data driver DD may supply the converted data signal Vdata to the plurality of data lines DL.

The timing controller TCON aligns the image data RGB input from the HOST system HOST to supply the aligned image data to the data driver DD. The timing controller TCON may generate the gate control signal GCS and the data control signal DCS by using the synchronization signals SYNC (e.g., dot clock signal, data enable signal, and horizontal/vertical synchronization signal) input from the HOST system HOST. In addition, the timing controller TCON may supply the generated gate control signal GCS and the data control signal DCS to the gate driver GD and the data driver DD, respectively, to control the gate driver GD and the data driver DD.

The HOST system HOST includes a system on chip SoC embedded with a scaler, and converts and outputs digital video data of an input image into image data RGB in a format suitable for display on the display panel DP. The HOST system HOST supplies synchronization signals SYNC (e.g., dot clock signal, data enable signal, and horizontal/vertical synchronization signal) to the timing controller TCON together with the image data RGB.

The display panel DP includes a plurality of subpixels SP as a configuration for displaying an image to a user. In the display panel DP, a plurality of scan lines SL and a plurality of data lines DL cross each other, and each of a plurality of sub-pixels SP is connected to the scan lines SL and the data lines DL. In addition, although not shown, each of the plurality of subpixels SP may be connected to a high potential power line, a low potential power line, an initialization signal line, a light emission control signal line, and the like.

The plurality of sub-pixels SP are the minimum unit constituting a picture, and each of the plurality of sub-pixels SP includes a light emitting diode and a pixel circuit for driving the light emitting diode. The plurality of light emitting diodes may be defined differently depending on the type of the display panel DP, and for example, when the display panel DP is an organic light emitting display panel, the light emitting diode may be an organic light emitting diode including an anode, an organic layer, and a cathode. In addition, as the light emitting diode, a quantum dot light emitting diode (OLED) including quantum dots QD, an inorganic Light Emitting Diode (LED), or the like may be further used. Hereinafter, it is assumed that the light emitting diode is an organic light emitting diode, but the type of the light emitting diode is not limited thereto.

The pixel circuit is a circuit for controlling the driving of the light emitting diode. The pixel circuit may be configured to include, for example, a plurality of transistors and one or more capacitors, but is not limited thereto.

Hereinafter, the encoder ICD and the decoder DCD in the display device 100 according to an exemplary embodiment of the present disclosure will be described in more detail with reference to fig. 2 to 5.

Fig. 2 is a block diagram of an encoder and a decoder of a display device according to an exemplary embodiment of the present disclosure. Fig. 3 is a flowchart for describing a driving method of a display device according to an exemplary embodiment of the present disclosure. Fig. 4 is a schematic diagram for describing encoding and decoding of a display device according to an exemplary embodiment of the present disclosure. Fig. 5 is a schematic diagram for describing an encoder of a display device according to an exemplary embodiment of the present disclosure.

Referring to fig. 2, the display device 100 further includes an encoder ICD and a decoder DCD.

The encoder ICD may compress the first image data IMD1 to generate second image data IMD 2. Here, the first image data IMD1 may be image data input to the encoder ICD, and the second image data IMD2 may be image data output from the encoder ICD to the decoder DCD.

The decoder DCD recovers the first image data IMD1 based on the second image data IMD2 of the encoder ICD to generate third image data IMD 3. The third image data IMD3 may be the image data output from the decoder DCD.

The display panel DP may display an image based on the third image data IMD 3.

The encoder ICD may be provided in the HOST system HOST and the decoder DCD may be provided on the timing controller TCON. At this time, the first image data IMD1 may be image data input to the HOST system HOST, the second image data IMD2 may be image data output from the HOST system HOST to be input to the timing controller TCON, and the third image data IMD3 may be image data output from the timing controller TCON to be input to the data driver DD.

On the other hand, in some exemplary embodiments, the encoder ICD may be provided in the timing controller TCON, and the decoder DCD may be input to the data driver DD. The first image data IMD1 may be image data input to the timing controller TCON, the second image data IMD2 may be image data output from the timing controller TCON to be input to the data driver DD, and the third image data IMD3 may be image data restored in the data driver DD.

In the present disclosure, the first image data IMD1 is described as RGB image data, but is not limited thereto, and all data (such as picture compensation data) used in the display device 100 are applicable.

For a more detailed description of the display device 100 and the driving method of the display device (S100) according to the exemplary embodiment of the present disclosure, referring to fig. 3, the encoder ICD compresses the first image data IMD1 to generate the second image data IMD2(S100), and the decoder DCD restores the first image data IMD1 based on the second image data IMD2 to generate the third image data IMD3 (S200).

First, the encoder ICD separates the first image data IMD1 into a plurality of sub-color data SCD (S110). The plurality of sub-color data SCD may include a first sub-color data SCD1, a second sub-color data SCD2, and a third sub-color data SCD 3. In the present disclosure, it is described that the first sub-color data SCD1 is red sub-color data, the second sub-color data SCD2 is green sub-color data, and the third sub-color data SCD3 is blue sub-color data, but is not limited thereto.

Next, the encoder ICD extracts high-frequency and low-frequency components of the first sub-color data SCD1, the second sub-color data SCD2, and the third sub-color data SCD3 (S120). At this time, the encoder ICD may extract high frequency components and low frequency components of the first sub-color data SCD1, the second sub-color data SCD2, and the third sub-color data SCD3 by using a discrete wavelet transform. However, the present invention is not limited thereto, and all transforms (such as fourier transform, fast fourier transform, and discrete cosine transform) capable of extracting high-frequency components and low-frequency components may be used. Hereinafter, for convenience of description, it will be described that the encoder ICD extracts high frequency components and low frequency components of the first sub-color data SCD1, the second sub-color data SCD2, and the third sub-color data SCD3 by using a discrete wavelet transform.

The discrete wavelet transform is a transform capable of expanding a digital signal by using a low-pass filter and a high-pass filter. The discrete wavelet transform is a one-dimensional transform performed by separating rows and columns of an image. The discrete wavelet transform low-pass filters and high-pass filters the image to generate a low (L) image and a high (H) image, and then repeats the low-pass filtering and the high-pass filtering for the L image and the H image. As a result, four different images LL, LH, HL, and HH are generated, and are referred to as subbands. The LL subband LL is an approximation of the image and is the subband with all high frequency information removed. The LH sub-band LH is an image in which a vertical edge is emphasized, as a sub-band in which high-frequency information is removed along a row and is emphasized along a column. The HL subband HL is an image with emphasized horizontal edges. The HH sub-band HH is an image in which diagonal edges are emphasized. Here, the high-frequency components are the HH subband HH, the HL subband HL, and the LH subband LH, and the low-frequency components are the LL subband LL.

Next, the encoder ICD calculates distances between high frequency components of the first sub-color data SCD1, the second sub-color data SCD2, and the third sub-color data SCD3, respectively (S130). The encoder ICD may calculate distances between high frequency components of the first sub-color data SCD1, the second sub-color data SCD2, and the third sub-color data SCD3, respectively, by using a method such as Mean Square Error (MSE). In fig. 5, it has been illustrated that: the high frequency component of the first sub-color data SCD1 is RThe high frequency component of the two sub-color data SCD2 is G, and the high frequency component of the third sub-color data SCD3 is B. Further, in fig. 5, it has been exemplified that: the distance between the high frequency component of the first sub-color data SCD1 and the high frequency component of the second sub-color data SCD2 is d_RGThe distance between the high frequency component of the second sub-color data SCD2 and the high frequency component of the third sub-color data SCD3 is d_GBAnd the distance between the high frequency component of the third sub-color data SCD3 and the high frequency component of the first sub-color data SCD1 is d_BR。

Next, the encoder ICD detects two sub-color data SCD having the closest distance between the high frequency components (S140). In fig. 5, it is assumed that the distance d between the high frequency component of the first sub-color data SCD1 and the high frequency component of the second sub-color data SCD2_RGIs the minimum value.

Next, the encoder ICD configures sub-color data SCD having a short distance between the high frequency component and the origin among two sub-color data SCD having the closest distance between the high frequency components as secondary sub-color data (S150). For example, as shown in fig. 5, when the distance d between the high frequency component of the first sub-color data SCD1 and the high frequency component of the second sub-color data SCD2_RGAt the minimum, the encoder ICD calculates a distance from the origin for each of the high frequency component of the first sub-color data SCD1 and the high frequency component of the second sub-color data SCD 2. In fig. 5, it has been illustrated that: the distance between the high frequency component of the first sub-color data SCD1 and the origin is d_RThe distance between the high frequency component of the second sub-color data SCD2 and the origin is d_GAnd the high frequency component of the third sub-color data SCD3 is at a distance d from the origin_B. Further, in fig. 5, it has been assumed that: distance d between high frequency component of second sub-color data SCD2 and origin_GIs smaller than the distance d between the high frequency component of the first sub-color data SCD1 and the origin_R. Thus, the encoder ICD may configure the second sub-color data SCD2 as secondary sub-color data.

In addition, the encoder ICD configures sub-color data SCD having a long distance between the origin and a high frequency component of the two sub-color data SCD having the closest distance between the high frequency components as main sub-color data (S150). Thus, the encoder ICD may configure the first sub-color data SCD1 as primary sub-color data.

Next, the encoder ICD generates low-frequency components of secondary sub-color data of the plurality of sub-color data SCD and the remaining sub-color data SCD as second image data IMD2 (S160). That is, the encoder ICD may generate the low frequency components of the first sub-color data SCD1, the third sub-color data SCD3 and the second sub-color data SCD2 as the second image data IMD 2. That is, in the encoder ICD, the first sub-color data SCD1 and the third sub-color data SCD3 transmit the complete data to the decoder DCD, while the second sub-color data SCD2 transmits only the low frequency component to the decoder DCD. Specifically, the encoder ICD may generate as the second image data IMD2 the HH sub-band HH, HL sub-band HL, LH sub-band LH and LL sub-band LL of the first sub-color data SCD1, the HH sub-band HH, HL sub-band HL, LH sub-band LH and LL sub-band LL of the third sub-color data SCD3, and the LL sub-band LL of the second sub-color data SCD 2.

Next, the encoder ICD transmits second image data IMD2 to the decoder DCD.

Next, the decoder DCD generates the restored secondary sub-color data RMSCD corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data in the second image data IMD2 and the high frequency component of one of the remaining sub-color data SCD (S210). The decoder DCD receives the second image data IMD2 including the low frequency components of the first sub-color data SCD1, the third sub-color data SCD3, and the second sub-color data SCD 2. As described above, the first sub color data SCD1 and the third sub color data SCD3 transmit the complete data to the decoder DCD, and the second sub color data SCD2 transmits only the low frequency component to the decoder DCD. Accordingly, the decoder DCD performs restoration on the second sub-color data SCD2 as the secondary sub-color data.

Specifically, the decoder DCD restores the second sub-color data SCD2 by using the low frequency component of the second sub-color data SCD2 as the secondary sub-color data and the high frequency component of the first sub-color data SCD1 as the primary sub-color data of one of the remaining sub-color data SCD. As described above, since the sub-color data SCD, which is the closest distance between the second sub-color data SCD2, which is the secondary sub-color data, and the high frequency component, is the primary sub-color data, the decoder DCD restores the second sub-color data SCD2 by using the high frequency component of the first sub-color data SCD1, which is one primary sub-color data. Specifically, the decoder DCD may generate the restored secondary sub-color data RMSCD corresponding to the second sub-color data SCD2 as the secondary sub-color data by using the HH, HL, and LH sub-bands HH, HL, and LH of the first sub-color data SCD1 and the LL sub-band LL of the second sub-color data SCD 2.

The decoder DCD generates the restored secondary sub-color data RMSCD and the remaining sub-color data SCD as the third image data IMD 3. The decoder DCD generates the restoration secondary sub-color data RMSCD for the second sub-color data SCD2, the first sub-color data SCD1, and the third sub-color data SCD3 as the third image data IMD 3. Accordingly, the decoder DCD may restore the third image data IMD3 corresponding to the first image data IMD 1.

In the display device, various data including image data may be transmitted between components. As display devices are implemented at high resolution, image data to be transmitted increases and data bandwidth also increases. Therefore, there is a problem in that an interface unit between the circuit unit and the component for processing the increased image data is expanded.

Accordingly, in the display apparatus 100 according to the exemplary embodiment of the present disclosure, the data bandwidth may be reduced using a frequency domain transform transmission method for image data. Specifically, in the encoder ICD, for the secondary sub-color data among the plurality of sub-color data SCD, only data corresponding to the low frequency component is transmitted to the decoder DCD. The decoder DCD uses the high frequency component of the primary sub-color data closest to the high frequency component of the secondary sub-color data and the low frequency component of the secondary sub-color data to generate the recovered secondary sub-color data RMSCD for the secondary sub-color data. Accordingly, in the display device 100 according to an exemplary embodiment of the present disclosure, the data bandwidth of the image data transmitted between the encoder ICD and the decoder DCD may be reduced to 25%.

Further, in the display apparatus 100 according to the exemplary embodiment of the present disclosure, the secondary sub-color data is restored by using the high frequency component of the primary sub-color data, thereby improving data restoration in restoring the image data. For a more detailed description thereof, reference is made together with the following table 1.

[ Table 1]

	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4	Examples of the invention
						First sample	44.372	33.433	36.973	43.356	55.789
Second sample	47.148	40.045	41.805	46.712	62.016
						Third sample	49.480	40.533	43.271	49.434	54.093
Fourth sample	48.458	42.161	43.910	48.506	52.249
						Fifth sample	49.442	40.932	43.292	50.545	54.657
Sixth sample	43.038	34.004	36.078	39.118	41.470
						The seventh sample	44.536	35.646	38.796	43.953	47.594
Eighth sample	49.820	40.010	42.855	50.085	52.505
						Ninth sample	48.672	40.160	42.488	47.995	53.357
Average PSNR (dB)	47.219	38.547	39.340	46.634	52.637

To experiment data recovery in the display apparatus 100 according to the exemplary embodiment of the present disclosure, nine sample images were used. In the respective experiments, in order to experiment on various data in terms of image brightness and image complexity, the image brightness and image complexity of a plurality of sample image data were normalized to values of 0 to 1. Thereafter, the image brightness and the image complexity are divided into three regions, respectively, and nine regions are defined in total in terms of the image brightness and the image complexity, and the first to ninth samples are sampled as sample images corresponding to each of the nine regions. Thereafter, PSNR (peak signal to noise ratio) of the data before recovery and the data after recovery was measured for the first to ninth samples in comparative example 1, comparative example 2, comparative example 3, comparative example 4, and examples.

Here, as for the data recovery method, comparative example 1 uses YCbcr422 (recovery method Bilinear), comparative example 2 uses JPEG (Q ═ 80), comparative example 3 uses JPEG (Q ═ 90), and comparative example 4 uses JPEG (Q ═ 100), and the same method as that of the display device 100 according to the exemplary embodiment of the present disclosure is used for the example.

Referring to table 1, in the example, the average PSNR of nine images was measured up to about 52.637dB, as compared to comparative examples 1 to 4. Therefore, it can be confirmed that the data recovery is excellent as compared with the compression algorithms such as comparative examples 1 to 4 that have been used in the related art.

Embodiments of the invention may also be described as follows.

According to an aspect of the present disclosure, a display apparatus includes: an encoder that compresses first image data to generate second image data; a decoder that restores the first image data based on the second image data from the encoder to generate third image data; and a display panel that displays an image based on the third image data, wherein the encoder separates the first image data into a plurality of sub-color data and generates a low frequency component of the secondary sub-color data and the remaining sub-color data among the plurality of sub-color data as the second image data, and the decoder generates restored secondary sub-color data corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data and a high frequency component of one sub-color data among the remaining sub-color data in the second image data and generates the restored secondary sub-color data and the remaining sub-color data as the third image data.

The plurality of sub-color data may include first sub-color data, second sub-color data, and third sub-color data. The encoder may extract high frequency components and low frequency components of the first sub-color data, the second sub-color data, and the third sub-color data.

The encoder may extract high frequency components and low frequency components of the first sub-color data, the second sub-color data, and the third sub-color data by using a discrete wavelet transform.

The high-frequency components may be the HH sub-band, the HL sub-band, and the LH sub-band. The low frequency component may be the LL subband.

The encoder may calculate a distance between the high frequency components of each of the first, second, and third sub-color data, and may detect two sub-color data having the closest distance between the high frequency components.

The encoder may configure sub-color data, of the two sub-color data, having a short distance between the high frequency component and the origin as the secondary sub-color data, and may configure sub-color data, of the two sub-color data, having a long distance between the high frequency component and the origin, as the primary sub-color data.

The decoder may generate the recovered secondary sub-color data by using the low frequency component of the secondary sub-color data and the high frequency component of the primary sub-color data.

The display apparatus may further include a host system in which the encoder is disposed and a timing controller in which the decoder is disposed.

The display apparatus may further include a timing controller in which the encoder is disposed and a data driver in which the decoder is disposed.

According to another aspect of the present disclosure, a driving method of a display device includes: generating second image data by compressing the first image data; and generating third image data by restoring the first image data based on the second image data, wherein the step of generating the second image data includes the steps of: separating the first image data into a plurality of sub-color data, and generating a low-frequency component of a secondary sub-color data and remaining sub-color data among the plurality of sub-color data as second image data; and the step of generating the third image data comprises the steps of: generating restored secondary sub-color data corresponding to the secondary sub-color data by using a low frequency component of the secondary sub-color data in the second image data and a high frequency component of one of the remaining sub-color data, and generating the restored secondary sub-color data and the remaining sub-color data as third image data.

The plurality of sub-color data may include first sub-color data, second sub-color data, and third sub-color data. The step of generating the second image data may further include the steps of: high-frequency components and low-frequency components of the first sub-color data, the second sub-color data, and the third sub-color data are extracted.

The step of generating the second image data may further include the steps of: the distance between the high frequency components of each of the first, second, and third sub-color data is calculated, and two sub-color data having the closest distance between the high frequency components are detected.

The step of generating the second image data may further include the steps of: the sub-color data having a short distance between the high frequency component and the origin in the two sub-color data is configured as the secondary sub-color data, and the sub-color data having a long distance between the high frequency component and the origin in the two sub-color data is configured as the primary sub-color data.

The step of generating the recovery secondary sub-color data may further include the steps of: the recovery secondary sub-color data is generated by using the low frequency component of the secondary sub-color data and the high frequency component of the primary sub-color data.

Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and may be embodied in many different forms without departing from the technical concept of the present disclosure. Accordingly, the exemplary embodiments of the present disclosure are provided for illustrative purposes only, and are not intended to limit the technical concept of the present disclosure. The scope of the technical idea of the present disclosure is not limited thereto. Therefore, it should be understood that the above-described exemplary embodiments are illustrative in all respects and not restrictive of the disclosure. The scope of the present disclosure should be construed based on the appended claims, and all technical ideas within the equivalent scope thereof should be understood to fall within the scope of the present disclosure.

Cross Reference to Related Applications

This application claims priority from korean patent application No.10-2020-0189236, which was filed on 31.12.2020 and whose disclosure is incorporated herein by reference.

Claims

1. A display device, comprising:

an encoder that compresses the first image data to generate second image data;

a decoder that restores the first image data based on the second image data from the encoder to generate third image data; and

a display panel that displays an image based on the third image data,

wherein the encoder separates the first image data into a plurality of sub-color data and generates a low-frequency component of a secondary sub-color data and remaining sub-color data among the plurality of sub-color data as the second image data,

the decoder generates restored secondary sub-color data corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data in the second image data and a high frequency component of one of the remaining sub-color data, and generates the restored secondary sub-color data and the remaining sub-color data as the third image data.

2. The display device according to claim 1, wherein the plurality of sub-color data includes first sub-color data, second sub-color data, and third sub-color data, and

the encoder extracts high-frequency components and low-frequency components of the first sub-color data, the second sub-color data, and the third sub-color data.

3. The display apparatus according to claim 2, wherein the encoder extracts the high frequency component and the low frequency component of the first sub-color data, the second sub-color data, and the third sub-color data by using a discrete wavelet transform.

4. The display device according to claim 3, wherein the high-frequency components are an HH subband, an HL subband, and an LH subband, and the low-frequency components are an LL subband.

5. The display device according to claim 4, wherein the LH sub-band, which is a sub-band in which high-frequency information is removed along lines and the high-frequency information is emphasized along columns, is an image in which vertical edges are emphasized, the HL sub-band is an image in which horizontal edges are emphasized, the HH sub-band is an image in which diagonal edges are emphasized, and the LL sub-band is an approximation of the image and is a sub-band in which all high-frequency information is removed.

6. The display apparatus according to claim 2, wherein the encoder calculates a distance between high frequency components of each of the first sub-color data, the second sub-color data, and the third sub-color data, and

two sub-color data closest in distance between the high-frequency components are detected.

7. The display device according to claim 6, wherein the encoder configures sub-color data having a short distance between the high-frequency component and an origin among the two sub-color data as the secondary sub-color data, and

configuring sub-color data having a long distance between the high-frequency component and an origin among the two sub-color data as main sub-color data.

8. The display apparatus according to claim 7, wherein the decoder generates the recovered secondary sub-color data by using the low-frequency component of the secondary sub-color data and the high-frequency component of the primary sub-color data.

9. The display device according to claim 1, wherein the first image data is image data input to the encoder, and the second image data is image data output from the encoder to the decoder, and the third image data is image data output from the decoder.

10. The display device of claim 1, further comprising:

a host system in which the encoder is provided; and

a timing controller in which the decoder is provided.

11. The display device according to claim 1, further comprising:

a timing controller in which the encoder is provided; and

a data driver in which the decoder is provided.

12. A driving method of a display device, the driving method of the display device comprising the steps of:

generating second image data by compressing the first image data; and

generating third image data by restoring the first image data based on the second image data,

wherein the step of generating the second image data comprises the steps of:

separating the first image data into a plurality of sub-color data; and

generating a low frequency component of a secondary sub-color data and remaining sub-color data among the plurality of sub-color data as the second image data,

wherein the step of generating the third image data comprises the steps of:

generating recovered secondary sub-color data corresponding to the secondary sub-color data by using the low frequency component of the secondary sub-color data in the second image data and a high frequency component of one of the remaining sub-color data; and

generating the recovery secondary sub-color data and the remaining sub-color data as the third image data.

13. The driving method of a display device according to claim 12, wherein the plurality of sub color data includes first sub color data, second sub color data, and third sub color data, and

the step of generating the second image data further comprises the steps of: extracting high-frequency components and low-frequency components of the first sub-color data, the second sub-color data, and the third sub-color data.

14. The driving method of the display device according to claim 13, wherein the step of generating the second image data further comprises the steps of:

calculating a distance between high frequency components of each of the first sub-color data, the second sub-color data, and the third sub-color data; and

15. The driving method of the display device according to claim 14, wherein the step of generating the second image data further comprises the steps of:

configuring sub-color data having a short distance between the high frequency component and an origin among the two sub-color data as the secondary sub-color data, and configuring sub-color data having a long distance between the high frequency component and the origin among the two sub-color data as primary sub-color data.

16. The driving method of a display device according to claim 15, wherein the step of generating the recovery secondary sub-color data further comprises the steps of:

generating the recovered secondary sub-color data by using the low frequency component of the secondary sub-color data and the high frequency component of the primary sub-color data.